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Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net periodic defined benefit credit $ (47) $ (27) $ (91)
Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 35 31 37
Interest cost 82 85 62
Expected return on plan assets 179 166 201
Amortization of prior service (credit) cost (15) (14) (14)
Amortization of net loss 23 32 19
Total other components of net benefit credit or cost (89) (63) (134)
Net periodic defined benefit credit (54) (32) (97)
Actual return on plan assets $ 164 $ 338 $ (777)
Actual rate of return on plan assets, percent 6.26% 13.91% (23.02%)
Weighted-average assumptions, discount rate, percent 5.33% 5.60% 2.96%
Weighted-average assumptions, expected long-term return on plan assets, percent 6.75% 6.50% 6.50%
Weighted-average assumptions, rate of compensation increase, percent 4.50% 4.25% 4.00%
Non-Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2 $ 2 $ 2
Interest cost 9 9 6
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (7) (9) (9)
Amortization of net loss 4 4 9
Total other components of net benefit credit or cost 6 4 6
Net periodic defined benefit credit 8 6 $ 8
Actual return on plan assets $ 0 $ 0  
Weighted-average assumptions, discount rate, percent 5.33% 5.60% 2.96%
Weighted-average assumptions, rate of compensation increase, percent 4.50% 4.25% 4.00%
Postretirement Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0  
Interest cost 1 1 $ 1
Expected return on plan assets 2 2 3
Net periodic defined benefit credit (1) (1) (2)
Actual return on plan assets $ 0 $ 1 $ (4)
Actual rate of return on plan assets, percent 0.28% 2.61% (8.24%)
Weighted-average assumptions, discount rate, percent 5.43% 5.71% 2.79%
Weighted-average assumptions, expected long-term return on plan assets, percent 5.00% 5.00% 5.00%